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Re: [TLS] DTLS and large messages

<Pasi.Eronen@nokia.com> Wed, 16 June 2010 11:07 UTC

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From: Pasi.Eronen@nokia.com
To: Michael.Tuexen@lurchi.franken.de, juhovh@iki.fi
Date: Wed, 16 Jun 2010 13:07:09 +0200
Thread-Topic: [TLS] DTLS and large messages
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References: <E1ONiI8-0001C6-Ln@wintermute02.cs.auckland.ac.nz><4C149556.7040008@gnutls.org> <03826B11-ABC0-4F5B-A636-A07DECDF428C@iki.fi><AANLkTimYxYX8KqZ09bC-aglGU6D6W3JGH4gSlpmP4QCG@mail.gmail.com> <516FD065-D91B-4281-8448-5C79FADDD69A@ll.mit.edu> <00f301cb0c5b$f98cc2a0$4001a8c0@gateway.2wire.net> <4C1742A6.1050807@iki.fi> <772A444B-116B-4CC2-A63D-A2D15565E20F@lurchi.franken.de>
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Cc: tls@ietf.org
Subject: Re: [TLS] DTLS and large messages
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Michael Tüxen wrote:

> DTLS will not fragment any user data. So the application is limited
> by the path mtu.  When running DTLS/SCTP, SCTP announces a MTU of
> 2**14 and uses its own fragmentation, but for UDP this is not
> possible.  To use user messages larger than 2^14, you need a link
> layer with an MTU of 2^14 or higher. Do you?

No, you can also use IP layer fragmentation (although that's not such
a great idea performance-wise if you're running over general
Internet -- instead of, say, inside a data center).

Best regards,
Pasi

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